/Engine/Source/Runtime/Engine/Public/kDOP.h
Stores 4 triangles in one struct (Struct Of Arrays).
struct FTriangleSOA
FVector4SOA
Normals
Triangle normal (including -W for a plane) for each of the 4 triangles.
uint32[4]
Payload
A 32-bit payload value for each of the 4 triangles.
FVector3SOA[3]
Positions
3 vertex positions for each of the 4 triangles.